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The report consists of all the correspondence to date concerning the operations of the boundary survey commission. The survey to establish the boundary between the United States and Mexico according to the terms of the Treaty of Guadalupe Hidalgo was conducted from 1848 to 1855 by William B. Emory, under the direction of acting Secretary of the Interior Thomas Ewing. The large folding map: "Topographical Sketch of the Southernmost Point of the Port of San Diego, and Measurement of the Marine League for determining Initial Point of Boundary between the United States and Mexican Republic as Surveyed by the United States Commission" by John B Weller and Andrew B. Gray is dated 1849. It shows the route followed by the United States Commissioner to Serro de los Pinos, August 1849 beginning near Camp Riley down into Mexico near Achilld's Ranch.